The Structure, Dielectric, and Optical Properties of c-Oriented SBN-50 Films Grown on Pt/Al2O3 Substrate

Studies of the structure, dielectric and optical properties of thin films of a relaxor ferroelectric Ba 0.5 Sr 0.5 Nb 2 O 6 grown on Pt(111)/Al 2 O 3 (c-cut) substrate by high-frequency RF-sputtering in oxygen atmosphere, were performed. X-ray diffraction studies showed that Ba 0.5 Sr 0.5 Nb 2 O 6 films are c-oriented. The unit cell parameters in the tetragonal approximation were c = 3.949(1) Å and a = 12.38(1) Å. It was established that the ferroelectric–paraelectric phase-transition temperature rises and optical anisotropy increases in the object in comparison with the bulk material. Reasons for the elucidated regularities are discussed.